دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

when the travel of the rod string at the pump (bottom of the well),is less than the surface rod travel.

A corrosion deposit occurring under a scale or bacterial deposition and thus not treatable by corrosion inhibitiors that are not designed for the purpose.

enlarge an existing borehole by a special bit that opens to a diameter larger than running diameter by hydraulic or mechanical method, or by use of a bi-center bit.

n: The amount of pressure (or force per unit area) exerted on a formation exposed in a wellbore below the internal fluid pressure of that formation. If sufficient porosity and permeability exist, formation fluids enter the wellbore. The drilling rate typical

when the pressure exerted by the column of fluid in the wellbore is less than the pore pressure in the formation.

drilling with a pressure in the wellbore that is lower than the pressure in the formation.

IADC-UBO term. Performance enhancement only;no zones containing hydrocarbons.

IADC-UBO term. Well incapable of flow to surface.

IADC-UBO term. Well capable of natural flow to surface, but conventional well kill methods are enabled, and limited consequences are possible in case of catastrophic equipment failure.

IADC-UBO term. Geothermal and non-hydrocarbon production. Maximum shut-in pressures are less than UBD equipments operating pressure rating. Catastrophic failure has immediate, serious consequences.

IADC-UBO term. Hydrocarbon production. Maximum shut-in pressures are less than UBD equipments operating pressure rating. Catastrophic failure has immediate, serious consequences.